Spontaneous Emission Spectrum in Double Quantum Dot Devices

A double quantum dot device is a tunable two-level system for electronic energy states. A dc electron current was used to directly measure the rates for elastic and inelastic transitions between the two levels. For inelastic transitions, energy is exchanged with bosonic degrees of freedom in the env...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1998-10, Vol.282 (5390), p.932-935
Main Authors: Fujisawa, Toshimasa, Oosterkamp, Tjerk H., van der Wiel, Wilfred G., Broer, Benno W., Aguado, Ramón, Tarucha, Seigo, Kouwenhoven, Leo P.
Format: Article
Language:English
Subjects:
Climate
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electric current
Electric potential
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in interface structures
Electrons
Emission spectra
Energy
Environment
Exact sciences and technology
Phonons
Physics
Pollutant emissions
Quantum dots
Quantum electronics
Quantum theory
Spontaneous emission
Tunneling
Tunnels
Vacuum
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Summary:A double quantum dot device is a tunable two-level system for electronic energy states. A dc electron current was used to directly measure the rates for elastic and inelastic transitions between the two levels. For inelastic transitions, energy is exchanged with bosonic degrees of freedom in the environment. The inelastic transition rates are well described by the Einstein coefficients, relating absorption with stimulated and spontaneous emission. The most effectively coupled bosons in the specific environment of the semiconductor device used here were acoustic phonons. The experiments demonstrate the importance of vacuum fluctuations in the environment for quantum dot devices and potential design constraints for their use for preparing long-lived quantum states.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.282.5390.932